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c586980732
Currently io_context and cfq logics are mixed without clear boundary. Most of io_context is independent from cfq but cfq_io_context handling logic is dispersed between generic ioc code and cfq. cfq_io_context represents association between an io_context and a request_queue, which is a concept useful outside of cfq, but it also contains fields which are useful only to cfq. This patch takes out generic part and put it into io_cq (io context-queue) and the rest into cfq_io_cq (cic moniker remains the same) which contains io_cq. The following changes are made together. * cfq_ttime and cfq_io_cq now live in cfq-iosched.c. * All related fields, functions and constants are renamed accordingly. * ioc->ioc_data is now "struct io_cq *" instead of "void *" and renamed to icq_hint. This prepares for io_context API cleanup. Documentation is currently sparse. It will be added later. Changes in this patch are mechanical and don't cause functional change. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
#ifndef IOCONTEXT_H
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#define IOCONTEXT_H
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#include <linux/radix-tree.h>
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#include <linux/rcupdate.h>
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#include <linux/workqueue.h>
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enum {
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ICQ_IOPRIO_CHANGED,
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ICQ_CGROUP_CHANGED,
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};
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struct io_cq {
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struct request_queue *q;
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struct io_context *ioc;
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struct list_head q_node;
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struct hlist_node ioc_node;
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unsigned long changed;
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struct rcu_head rcu_head;
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void (*exit)(struct io_cq *);
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void (*release)(struct io_cq *);
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};
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/*
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* I/O subsystem state of the associated processes. It is refcounted
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* and kmalloc'ed. These could be shared between processes.
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*/
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struct io_context {
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atomic_long_t refcount;
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atomic_t nr_tasks;
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/* all the fields below are protected by this lock */
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spinlock_t lock;
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unsigned short ioprio;
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/*
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* For request batching
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*/
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int nr_batch_requests; /* Number of requests left in the batch */
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unsigned long last_waited; /* Time last woken after wait for request */
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struct radix_tree_root icq_tree;
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struct io_cq __rcu *icq_hint;
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struct hlist_head icq_list;
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struct work_struct release_work;
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};
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static inline struct io_context *ioc_task_link(struct io_context *ioc)
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{
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/*
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* if ref count is zero, don't allow sharing (ioc is going away, it's
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* a race).
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*/
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if (ioc && atomic_long_inc_not_zero(&ioc->refcount)) {
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atomic_inc(&ioc->nr_tasks);
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return ioc;
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}
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return NULL;
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}
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struct task_struct;
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#ifdef CONFIG_BLOCK
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void put_io_context(struct io_context *ioc, struct request_queue *locked_q);
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void exit_io_context(struct task_struct *task);
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struct io_context *get_task_io_context(struct task_struct *task,
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gfp_t gfp_flags, int node);
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void ioc_ioprio_changed(struct io_context *ioc, int ioprio);
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void ioc_cgroup_changed(struct io_context *ioc);
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#else
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struct io_context;
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static inline void put_io_context(struct io_context *ioc,
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struct request_queue *locked_q) { }
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static inline void exit_io_context(struct task_struct *task) { }
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#endif
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#endif
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